2019年2月28日星期四

Design points for injection molding parts


Design points for injection molding parts




In the injection molding process, due to the uneven cooling and uneven shrinkage of the plastic in the cavity and the unreasonable structural design of the injection molded part, it is easy to cause various defects of the product:

Shrinkage, weld marks, pores, deformation, napping, top injury, flash.
  
In order to obtain high-quality injection molding products, we must fully consider the structural processability when designing the products. The following is a combination of the main structural characteristics of the injection molding products to analyze the methods to avoid injection defects. Design points for injection molding parts

1 mold opening direction and parting line
Each injection molding product must first determine its mold opening direction and parting line at the beginning of the design to ensure that the core pulling mechanism is minimized and the influence of the parting line on the appearance is eliminated.

  1.1 After the mold opening direction is determined, the reinforcement ribs, snaps, protrusions, and other structures of the product are designed to be consistent with the mold opening direction as much as possible to avoid the core pulling to reduce the seam line and prolong the life of the mold.

1.2, For example, the direction of the mold opening of the bumper is generally the direction of the body coordinate,. If the mold opening direction is designed to be inconsistent with the χ axis, the angle must be indicated in the product drawing.
  
1.3 After the mold opening direction is determined, the appropriate parting line can be selected to improve the appearance and performance.

2 draft angle

2.1 Appropriate draft angle can avoid product pulling. The smooth surface should have a draft angle greater than 0.5 degrees, a fine grain surface greater than 1 degree, and a rough grain surface greater than 1.5 degrees.

2.2 Appropriate draft angle can avoid product top injury.
  
2.3 Deep cavity structure product design When the outer surface slope is required to be smaller than the inner surface slope, to ensure that the mold core is not biased during injection, to obtain a uniform product wall thickness, and to ensure the material density strength of the product opening.

3 product wall thickness

   3.1 All kinds of plastics have a certain wall thickness range, generally 0.5 ~ 4mm, when the wall thickness exceeds 4mm, it will cause the cooling time is too long, resulting in shrinkage and other issues should consider changing the product structure.
  
3.2 Uneven wall thickness will cause surface shrinkage.
3.3 Uneven wall thickness can cause pores and weld lines.

4 stiffeners

4.1 Reasonable application of ribs can increase product rigidity and reduce deformation.
 4.2 The thickness of the ribs must be less than 1/3 of the wall thickness of the product, otherwise the surface will be reduced.


2019年2月18日星期一

New purchasing strategies in the global economic slowdown



What will happen to the world economy in 2019? A large number of uncertain factors have left the world economy in a fog, and overall, anxiety and optimism coexist. Basically, the global economy will slow down in 2019. Since the beginning of 2018, emerging market economies have suffered from capital outflows, weakening the economies of emerging countries, leading to currency depreciation, rising inflation, and reduced household purchasing power. In the second half of the year, some emerging markets broke out in a currency crisis, geopolitical situations were once again tense, trade frictions escalated, and the risk of a resurgence of the crisis was reshaping new growth patterns through different forms.

In the global economic downturn in 2019, companies have become increasingly difficult to survive. Especially for large and medium-sized enterprises, faced with high labor costs, rental pressures, and rising raw material prices. How to find the right supplier, reduce the procurement cost and ensure the quality?

1, how to reduce procurement costs


Currently, companies are in a highly competitive and rapidly changing environment, and competition has caused the industry's average profit to fall. It is increasingly difficult for companies to establish or maintain sustainable competitive advantage through sales and production; there is still room for development in the procurement field that has been neglected for many years.

Effectively reducing the overall cost of procurement and integrating supplier capabilities through strategic procurement will become an important source for leading companies to continuously reduce procurement costs and enhance their competitive advantage. Therefore, the focus of procurement is on how to choose suppliers, especially the supplier price comparison that pays more attention to the transaction process. Through the competition of suppliers, choose the lower price as the partner. Perhaps the blind pursuit of low prices may lead to a decline in quality. If you cooperate with CN-MOULDING, you don't have to worry about this problem. CN-MOULDING is a typical small and medium-sized enterprise in China. The company is not too large. It is a real manufacturing enterprise. CN-MOULDING can supply customers directly, eliminating all the difference in the middle and reducing costs. The company coordinates Shanghai has geographical advantages, convenient import and export, familiar with business operations, saving time and cost.

2, how to choose low-cost high-quality suppliers

Taking CN-MOULDING as an example, an injection mold company was established in 1997 and has been a small and medium-sized private enterprise for 20 years. Since its establishment, it has been focusing on mold manufacturing and injection molding. Since 2001, it has been engaged in the foreign trade business. It has a large customer base and recognition in Europe and America. With its exquisite technology and rich experience, it has been provided to customers in more than ten countries and regions. solution:
1. Help customers to properly adjust the wall thickness of the product and find the best balance between product quality and production cost.
2, predicting the appearance of weld defects, gas marks, trapped gas, and other defects,
3, predict and control on the mold. Predict product distortion,
4, Help customers to improve the product assembly structure, the front design to avoid deformation.
5, rationally arrange the glue and cooling system to achieve the best process and the most economical investment.
6, to provide optimized production process parameters to help customers solve the problem of product injection production.

The following mold is produced by CN-MOULDING for American customers. It is bulky, thin wall, complex in structure, high in precision, and more difficult to de-mold the gas roof unit. At that time, CN-MOULDING was not the first choice partner of customers, but more inclined to have large companies on a large scale. In the eyes of customers, big companies mean high quality, high standard, on-time delivery, after-sales service and so on. But ignoring an important issue is the cost of procurement, the quality of the mold is excellent, is the price equally satisfactory?

After the customer revealed that the original mold price was 680,000 RMB, far exceeding their budget. Then the friends around me came to Shanghai CN-MOULDING company to visit and inspect, and offered the quotation on the spot, the total price was 476,000 RMB. They said that it is hard to believe, after all, the price is only 70% of the previous company. It is also doubtful that such a low price can really be achieved? Can you really guarantee the quality of the mold? Is the after-sales service guaranteed? Wait for a series of questions. CN-MOULDING has shown that the larger and more difficult mold cases that have been done before have been shown to customers. Although CN-MOULDING is a small and medium-sized enterprise, it has 20 years of experience in mold manufacturing, and the cooperative companies have many world-class companies. The business has also spread to more than ten countries and regions. Numerous successful cooperation cases have enabled customers to have confidence that CN-MOULDING is a professional, experienced and trustworthy mold manufacturing company.





China's small businesses are fundamental to the vitality of production

There are tens of thousands of small and medium-sized enterprises in China. SMEs are the most dynamic and innovative enterprise groups in China. At the same time, SMEs provide more than 50% of tax revenue, create more than 60% of GDP, and complete more than 70% of invention patents, providing 80%. More than % of urban jobs. SMEs have a pivotal position and have unique advantages. With reasonable prices, rich experience and reliable quality, they are gradually replacing the original large enterprises.

CN-MOULDING is a small and medium-sized enterprise in China that is dynamic, innovative, and professional, and directly supplied to foreign countries. In 2015, we obtained ISO9001:2000 quality certification! With 20 years of integrity, 20 years of experience, and 20 years of quality assurance and after-sales protection.